Guess few of might have had issues with uploading images which were referenced in the main Critique gallery - ie Images with corrections suggested by fellow users, or images in color or B&W etc. Below is a small step by step writeup on how one can put up the Illustration forum thread.

Step 1 - Go to Illustration forum and click on New Topic

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Step 2 - Enter the necessary Subject and Description and click on the Upload attachment link in the bottom to Upload the new version of the image and click on Place Inline option

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Step 3 - Upon clicking Place Inline, the description of the post will be updated to reflect uploaded image

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Step 4 - Copy the Image BBcode corresponding to the old image from your image post in Critique gallery which is below your image description [This is just for comparison and totally optional]

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Step 5 - Paste the Image BBCode in the description field of the post and click on Submit.